I want to measure sound pressure inside a vessel containg water (ultrasound source is a t bottom) I am using ICP sensor from PCB 105C13 (specification sheet attached) with external power supply. I am using Labview 9 and PCI-6111E DAQ board. For a sound input of 40KHz and 20 W I want to measure the rms pressure at different points in the vessel. I tried to measure the effect of sample amount and sampling rate on the rms pressure calculated. But as shown in teh attached sheet as soon as I increase teh sampling rate the rms pressure also increases. So it is difficult for me to get an accurate pressure. Kindly guide me if someone has any idea.

LabVIEW

Ups, read the wron value,102 is the db value. Then take the NI USB-4431 which has a sampling rate of 102,4 kHz.

Andreas Stark
LabVIEW Lead @ Rocket Factory Augsburg

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